1
In MS20073-4, what does the “4” represent?
4/16" or 1/4" diameter
In AN bolt numbering, what does the number after the dash (example: AN4-15) represent?
Bolt length in 1/8" increments
What is the length of an AN3-7 bolt?
7/8"
Why would corrosion-resistant steel (CRES) be used over aluminum in rigid tubing?
For higher strength and corrosion resistance
What does the letter “H” mean if added to an AN bolt part number?
Drilled head for safety wire
Do you always have to carry out a torque wrench calculation installing hydraulic lines?
yes
What does the letter “C” indicate in a bolt part number?
Stainless steel bolt
What does the dash number in MS20073-06 mean?
Bolt length
Is rigid tubing an on-condition item or time life?
on-condition item
What is the diameter of an AN6 bolt?
3/8"
The dash number in AN4-5 tells you the:
length
The “5” in AN4-5 means:
5/8"
AN bolt diameters are measured in:
1/16"
What are the 2 categories of hydraulic lines?
Rigid and flexible
What are the 3 materials used in aircraft rigid tubing?
Aluminum, corrosion-resistant steel (CRES), and copper-nickel alloy
What do the letters “DD” indicate in a bolt part number?
Corrosion-resistant steel
What is the diameter of an AN3 bolt?
3/16"
Can rigid tubing ever be repaired or fabricated?
Yes, if within tolerances
Would tube beading be used on very high or very low pressure lines?
High pressure
What is the part number A.N. 818?
37° flare nut
What is the part number A.N. 819?
A 37° flare sleeve
What does the “A” suffix mean in an AN bolt number (example: AN4-15A)?
Undrilled shank
What tool is used to set the clearance of the nipple and shoulder?
Nipple gauge or feeler gauge
What are the 3 parts of a flex line?
Inner liner, reinforcement layer, outer cover.
What are the 2 categories of flexible lines?
Rubber and Teflon/PTFE lines